We have booked for a night stay at monomer 2 given its location beside the BTS. However, upon check-in, we were "upgraded" to another room instead at a completely different location instead. Yes, the room "upgrade" was that it was much bigger given that it contains 3 queen size bed. But the room provided to us was located under "House of PhayaThai" instead. It is 2 streets away from the original Monomer 2 which we have booked. What was terrible is that the room was filled with mosquito. I had to spend so much time and effort killing some of it and there were still some flying around. My partner have sensitive skin and it was such a bad experience. We had stayed at other hostels in Bangkok before and have never encountered such incidents. Also, the location of "House of PhayaThai" was right beside the main road & the BTS track. It is awfully noisy despite closing all the windows. There was no main reception at the help desk and if we had to seek for help, we had to walk 2 streets just to get to the main help desk. Overall, a very bad experience. There are definitely much better hostels in Bangkok to which you can book.